Pile foundations play a crucial role in providing structural support for offshore installations like sea bridges, wind turbines, oil drilling platforms etc., are designed to withstand the cyclic lateral loads induced by environmental factors such as wind, waves etc. As compared to static loading, cyclic loading can gradually distort piles laterally, possibly affecting their long-term strength and fatigue life. Furthermore, placing piles on sloping ground, which is frequently required due to geological conditions and seawater erosion, complicates their behavior when compared to those on level ground. This study makes a humble attempt at examining the behavior of a group of piles placed on a sloped ground by using PLAXIS 3D. The synergistic effects of sloping ground and cyclic lateral loading on lateral deflection patterns and bending moment distribution within the pile group were studied. It was perceived that when the slope increases, the lateral load capacity of the pile group reduces. The capacity reduces by 33% for a 1 V:3H slope and 20% for a 1 V:5H slope under static lateral load. For cyclic lateral loading, at n = 50 cycles, the displacement increases by 23.67% for a 1 V:5H slope and 85.62% for a 1 V:3H slope as compared to level ground. It is noticeable that the moment increases as the cycle progress, but the rate of increase slows down over time. For instance, after 50 cycles, the maximum bending moment reaches around 65–85% of its value after 300 cycles.

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Cyclic Loading Effects on Laterally Loaded Piles in Non Cohesive Soil on Sloped Ground: A Numerical Study

  • Pappu Kumar Choudhary,
  • Kiran Rathod,
  • Kowshik Yedire,
  • Kalyan Kumar Gonavaram

摘要

Pile foundations play a crucial role in providing structural support for offshore installations like sea bridges, wind turbines, oil drilling platforms etc., are designed to withstand the cyclic lateral loads induced by environmental factors such as wind, waves etc. As compared to static loading, cyclic loading can gradually distort piles laterally, possibly affecting their long-term strength and fatigue life. Furthermore, placing piles on sloping ground, which is frequently required due to geological conditions and seawater erosion, complicates their behavior when compared to those on level ground. This study makes a humble attempt at examining the behavior of a group of piles placed on a sloped ground by using PLAXIS 3D. The synergistic effects of sloping ground and cyclic lateral loading on lateral deflection patterns and bending moment distribution within the pile group were studied. It was perceived that when the slope increases, the lateral load capacity of the pile group reduces. The capacity reduces by 33% for a 1 V:3H slope and 20% for a 1 V:5H slope under static lateral load. For cyclic lateral loading, at n = 50 cycles, the displacement increases by 23.67% for a 1 V:5H slope and 85.62% for a 1 V:3H slope as compared to level ground. It is noticeable that the moment increases as the cycle progress, but the rate of increase slows down over time. For instance, after 50 cycles, the maximum bending moment reaches around 65–85% of its value after 300 cycles.